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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0ad0f0fdedb19c4e1e36e7e17d42c62910b2c0e5f8c3e2ba91754cd904eade' 
  AND token = '3FHpN5Va7u5ynqMdL/3MtwBKqB81GLSJdSMU7zE5OM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}